From: "Ara.T.Howard" <Ara.T.Howard@...>
Date: 2005-07-21T22:50:00+09:00
Subject: Re: [BUG] Segmentation fault with a threads/forks script

On Thu, 21 Jul 2005, Lucas Nussbaum wrote:

> Hi,
>
> I experience a reproducable crash (each time) with prunner.rb at
> http://blop.info/bazaar/prunner.rb. The script starts several commands
> at the same time. When running with a large number of commands, it
> exits with :
>
> ./prunner.rb:51: [BUG] Segmentation fault
> ruby 1.8.2 (2005-04-11) [i386-linux]
>
> Aborted
>
> To reproduce, create a large file with one command per line.
> for i in $(seq 1 2000); do echo hostname done > cmds
> Then run prunner.rb like this :
> cat cmds |head -n 1500 |./prunner.rb
> 1500 can be increased if it doesn't crash for you.
>
> Of course, I expect it to go wrong at some time, but it could probably
> do this in a cleaner way.
>
> Can somebody confirm the bug ? Or better, fix it ? :-)


seems to work on 1.8.2 for values around 1000:

   [ahowward@localhost ~]$ wget http://blop.info/bazaar/prunner.rb
   --07:25:29--  http://blop.info/bazaar/prunner.rb
              => `prunner.rb'
   Resolving blop.info... 85.68.8.93
   Connecting to blop.info[85.68.8.93]:80... connected.
   HTTP request sent, awaiting response... 200 OK
   Length: 2,125 [text/plain]

   100%[======================================================================================================================================>] 2,125         --.--K/s

   07:25:29 (42.22 MB/s) - `prunner.rb' saved [2,125/2,125]

   [ahoward@localhost ~]$ for i in $(seq 1 2000);do echo 'date'; done > cmds
   [ahoward@localhost ~]$ wc -l cmds
   2000 cmds
   [ahoward@localhost ~]$ ruby prunner.rb < cmds >/dev/null
   prunner.rb:47:in `popen': Too many open files - date 2>&1 (Errno::EMFILE)
           from prunner.rb:47
           from prunner.rb:47:in `each'
           from prunner.rb:47
   [ahoward@localhost ~]$ head -1000 cmds |ruby prunner.rb >/dev/null
   [ahoward@localhost ~]$ echo $?
   0
   [ahoward@localhost ~]$ ruby -v
   ruby 1.8.2 (2005-02-12) [i686-linux]
   [ahoward@localhost ~]$ uname -srm
   Linux 2.6.12-1.1372_FC3 i686
   [ahoward@localhost ~]$ cat /etc/redhat-release
   Fedora Core release 3 (Heidelberg)


and on 1.9:

   harp:~ > wget http://blop.info/bazaar/prunner.rb
   --07:42:37--  http://blop.info/bazaar/prunner.rb
              => `prunner.rb.1'
   Resolving blop.info... 85.68.8.93
   Connecting to blop.info[85.68.8.93]:80... connected.
   HTTP request sent, awaiting response... 200 OK
   Length: 2,125 [text/plain]

   100%[======================================================================================================================================>] 2,125         --.--K/s

   07:42:37 (343.01 KB/s) - `prunner.rb.1' saved [2,125/2,125]

   harp:~ > for i in $(seq 1 2000);do echo 'date'; done > cmds
   harp:~ > wc -l cmds
      2000 cmds
   harp:~ > ruby prunner.rb < cmds >/dev/null
   prunner.rb:47:in `popen': Too many open files - date 2>&1 (Errno::EMFILE)
           from prunner.rb:47
           from prunner.rb:47:in `each'
           from prunner.rb:47
   harp:~ > head -1000 cmds|ruby prunner.rb >/dev/null
   harp:~ > echo $?
   0
   harp:~ > ruby -v
   ruby 1.9.0 (2005-05-16) [i686-linux]
   harp:~ > uname -srm
   Linux 2.4.21-32.0.1.EL i686
   harp:~ > cat /etc/redhat-release
   Red Hat Enterprise Linux WS release 3 (Taroon Update 5)


did you compile ruby yourself or use some installer/package-manager?

cheers.

-a
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